Which one of the following statements applies to atoms which are isotopes of the same element?
  • The number of electrons outside the nucleus is the same.
  • The mass numbers are the same.
  • The sum of the number of electrons and neutrons is the same.
  • The sum of the number of protons and neutrons is the same.
An atom of the most common isotope of platinum, has the following combination of protons, neutrons, and electrons.
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  • 78, 116, 78
  • 194, 78, 78
  • 78, 116, 78
  • 78, 194, 78
The nucleus of an atom of contains:
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  • 8 protons and 18 electrons
  • 8 protons and 18 neutrons
  • 8 protons and 10 neutrons
  • 10 protons and 8 neutrons
The atoms of different isotopes of same element differ from each other in the number of
  • Protons
  • Neutrons
  • Electrons in the inner shell only
  • Electrons in outer most shell only
Which statement is correct?
  • protons, neutrons and electrons together uniformly occupy the total volume of the atom
  • Neutrons and protons together have the least mass
  • Electrons occupy most of the space and contributes very little to the mass of the atom.
  • Electrons and protons have most of the mass and occupy very little space.
The radius of the nucleus of an atom is approximately:
  • 10-15 m
  • 1 nm
  • 10-10 m
  • 10-12 m
contains
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  • 12 neutrons
  • 22 nucleons
  • 22 protons
  • 22 neutrons
differ from each in respect of ?
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  • electrons
  • protons
  • neutrons
  • None of these
Thomson's plum pudding model explained:
  • Existence of protons
  • Electrical neutrality of an atom
  • Existence of electrons
  • Electrons move in fixed circular orbits
In which pair is the two species Isoelectronic?
  • As, P
  • O, F
  • Fe2+, Fe3+
  • O, N-
Which pair of species has the same number of electrons?
  • Fe, Mn+
  • Ar, K+
  • Te, Se
  • Mn, Tc
The smallest particle of an element which can take part in chemical reactions and may or may not exist independently is the
  • Nucleus
  • Compound
  • Atom
  • Neutron
The charge on electron was determined by
  • Crooks
  • Bohr
  • Milliken
  • Schrodinger
The ratio of e/m for cathode rays
  • Varies with gas in discharge tube
  • Is maximum when hydrogen is taken
  • Is fixed
  • Varies with different electrode
The three fundamental particles of the atom are
  • Mesons, Quarks and Anti-neutrino
  • Positron, Neutrino and Gamma Rays
  • Nucleus, Anti-quarks and Electrons
  • Proton, Neutron and Electron
A subshell with n = 6, = 2 can accomodate a maximum of
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  • 10 electrons
  • 72 electrons
  • 12 electrons
  • 36 electrons
The triad of nuclei that is isotonic is:
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  • A
  • B
  • C
  • D
The radius of an atom is approximately :
  • 10-12 cm
  • 1 nm
  • 1cm
  • 10-10 m
The nucleus of a tritium atom, 3H, contains
  • three protons
  • three neutrons
  • two protons and one neutron
  • two neutrons and one proton
Which of the following is true about electron:
  • It is negatively charged and is lighter than a proton.
  • It is negatively charged and has same mass as a proton.
  • It is positively charged and has no mass
  • None of the above
0 h : 0 m : 1 s

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